| The core part of the radio fuze system includes a transmitter and receiver. Classic receiver system generally consists of an antenna,mirror filters,low noise amplifiers,mixers,middle-frequency amplification circuit. I study video amplifier is a type of radio fuze important part of the receiver,mainly by the low noise amplifier and mixer amplifies the signal after processing,for subsequent analog-digital conversion and digital processing purposes.The video amplifier gain and bandwith requirements higher,components are smaller,the -10dB bandwith is 100KHz-80MHz,gain greater than 50 dB.In addition,taking into account the dynamic range from the received signal,also has the function of automatic gain control.In this paper,based on the AD8367 device,video amplifier with automatic gain control function to design a video signal,can be dynamic amplification for the peak to peak voltage signal is fixed,and the analog to digital converter level acquisition and processing.The difficulty of the design is to achieve a good performance of the automatic gain control environment,amplitude precisely fixed output,and achieve the 100KHz-80MHz range of 50 dB gain bandwidth requirements. |
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